Cup for an acoustical coupler



FIG. 1 is a bottom perspective view of a cup for an acoustical coupler showing my new design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a bottom plan view thereof; and

FIG. 4 is a top plan view thereof. 

The ornamental design for a cup for an acoustical coupler, substantially as shown and described. 